Add pipeline termination when processing is over

[PawelPeczek-Roboflow]

Description

We had a bug in batch processing leading processes to hang in a situation when there is error in inference thread - then Inference pipeline shuts down all of the internal threads apart from video sources - which are closed only when .terminate(...) is called.

This solution is just bug-fix - in new iteration of InferencePipeline we need to design it better to handle such cases.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How has this change been tested, please provide a testcase or example of how you tested the change?

• e2e test against problematic workflow

Any specific deployment considerations

For example, documentation changes, usability, usage/costs, secrets, etc.

Docs

• Docs updated? What were the changes: